Are you waiting for a cochlear implant? Here’s something you can do while you wait. Read some books in print that you can later access as audiobooks (from the library, Audible, Kobo, etc.).
After your CI activation, listen to the audiobooks, choosing the reader you find easiest to understand. Listen without re-reading the text, at first. Refer to the text if the difficulty is too high. If needed, slow down the playback speed.
After you finish listening, jot down a few notes about what you heard. That helps your brain make the connection between hearing and listening.
Related post: How does auditory training help?